He does post inaccurate info at times. His income is the clicks, so, like many other vloggers, he's desperate for content and reports everything 'he hears,' even if it's from unreliable sources or people that make suppositions without any basis for accuracy.
His "late July" was based on frontline CMs working TT. That's the kind of news just about anyone can share (and often do). Front line CMs do indeed sometimes get a heads-up with info regarding the attraction they work at. But... this isn't deep insider information.
And his CM sources were still off by over a month.